Open-domain Question Answering via Chain of Reasoning over Heterogeneous Knowledge Kaixin Ma author Hao Cheng author Xiaodong Liu author Eric Nyberg author Jianfeng Gao author 2022-12 text Findings of the Association for Computational Linguistics: EMNLP 2022 Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication ma-etal-2022-open-domain 10.18653/v1/2022.findings-emnlp.392 https://aclanthology.org/2022.findings-emnlp.392/ 2022-12 5360 5374